The Federal Reserve injected $3.75 billion, following the $3.5 billion it put into markets Monday. The European Central Bank allotted &euro;275 billion ($371 billion) in one-week funds, which is &euro;46 billion more than it estimated banks need for routine business. And the Bank of Japan put 800 billion yen ($6.96 billion) into its market, following an infusion of one trillion yen Monday.